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Censoring email from textarea form input

Using PHP I want to censor out anything that resembles an email address (.com, .co.uk,.com.au,.net,.biz, .us, all possibilities) from a textarea input, called "aboutme".
If people try and hide the email using common formats like me [at] hotmail [dot] come it would be cool to censor them too but I think that is pushing it as there are limitless ways to hide an email address.

Not sure what you mean be censor, but since it's in a form, it sounds like u should process the submitted fields with a regular expression and then do some string manipulation to do what you need to do.